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\begin{frame}
  \frametitle{Unnecessary Joins}

  \begin{exampleblock}{}
    \begin{tcenter}
    \scalebox{.9}{
    \parbox[t]{0.55\linewidth}{
      \tablestudents
    }\quad
    \parbox[t]{0.45\linewidth}{%
      \tableresults
    }}
    \end{tcenter}
  \end{exampleblock}
  \smallskip

  \begin{quiz}{\textwidth}{Is there any difference between these two queries?}
    \small
    \BUseVerbatim{remove}
  \end{quiz}
  %% If a student does not occur in RESULTS it is removed from the
  %% result in the second query (Maria Brown)
  %%
  %% Second query will also not list students with the same first and last name.
\end{frame}